NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Exploratory development of foams from liquid crystal polymersTwo types of liquid crystal polymer (LCP) compositions were studied and evaluated as structural foam materials. One is a copolymer of 6-hydroxy-2-naphthoic acid, terephthalic acid, and p-acetoxyacetanilide (designed HNA/TA/AAA), and the other is a copolymer of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid (designated HBA/HNA). Experimental results showed that the extruded HNA/TA/AA foams have better mechanical quality and appearance than HBA/HNA foams. Heat treatment improved foam tensile strength and break elongation, but reduced their modulus. The injection molding results indicated that nitrogen foaming agents with a low-pressure process gave better void distribution in the injection molded LCP foams than those made by the conventional injection-molding machine and chemical blowing agents. However, in comparing LCP foams with other conventional plastic foams, HBA/HNA foams have better mechanical properties than foamed ABS and PS, but are comparable to PBT and inferior to polycarbonate foams, especially in heat-deflection temperature and impact resistance energy. These deficiencies are due to LCP molecules not having been fully oriented during the Union-Carbide low-pressure foaming process.
Document ID
19850014443
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Chung, T. S.
(Celanese Research Corp. Summit, NJ, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1985
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA-CR-172510
NAS 1.26:172510
Report Number: NASA-CR-172510
Report Number: NAS 1.26:172510
Accession Number
85N22754
Funding Number(s)
CONTRACT_GRANT: NAS1-17290
PROJECT: RTOP 505-33-33
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available